Equipment for use in the manufacture of drawing dies



April 1, 1952 w. E. ROUX 2,591,298

EQUIPMENT FOR USE IN THE MANUFACTURE OF DRAWING DIES Filed June 1, 1950L Ii i mmvrole.

A TTOQ/VE-Y llll l l l l l l f l l l l l Patented Apr. 1, i952 EQUIPMENTFOR USE IN THE IVIANUFAC- TURE OF DRAWING DIES William E. Roux,Oriskany, N. Y.

Application June 1, 1950, Serial No. 165,395

4 Claims.

v 1 My invention relates to equipment to be used in the manufacture ofdrawing dies, such as diamond dies, carbide dies, and dies of other ma-.

terials.

The wire drawing industry today demands dies the holes in which aretruly round, the allowed tolerance in modern specifications being only.0092. To produce a die the hole in which is as nearly truly round orconcentric as this is a difficult problem, which is well recognized bythose engaged in this type of work.

During the manufacture of a wire drawing die it may be necessary toremove and replace the die from ten to thirty times, and, while presentequipment works fairly well where the tolerances are large so far asconcentricity of the hole is concerned, it does a poor andunsatisfactory job where under present-day exacting specifications thetolerance may be but .0902".

The apparatus constituting my invention is of such a nature that a holeof exact concentricity will be obtained regardless of the number oftimes it may be necessary to remove the die for examination, gaging,etc., or to reverse the work. My equipment is such that the exact centeror axis will never be disturbed.

In the accompanying drawing, I have illustrated, in part sectionalelevation, one embodiment of my invention.

Referring to the drawing in detail, 2 designates a die casing, whichcarries the element 3, in which the die is to be formed. As abovepointed out, the element 3 may be diamond, carbide, or other material.The primary object of my invention is to enable a hole of exactconcentricity to be provided in the element 3.

The die casing 2 'is set into a die receptacle 4,

the face of which is recessed for this purpose.

The recess in the die receptacle 4 is threaded, so as to receive aretaining nut 6, which, when screwed down, will retain the die casing infixed and immovable position in the die receptacle 4.

The die receptacle is circular in cross-section and is accuratelymachined so as firmly to fit within and be concentric with the innerrace 8 of precision-built ball bearing H].

To rotate the die receptacle 4 in the ball bearing 10, the ends of thereceptacle are extended beyond the sides of the race 8 and. are equippedwith driving pulleys I2 and I4. One of these pulleys, such as [2, may beintegral with the die receptacle, while the other may be a press fit onthe receptacle end, to facilitate assembling of the die receptacle withthe ball bearing. It will be appreciated that means other than thepulleys i2 and 14 may be employed to drive the die receptacle andbearing race. For example, a gear train could be employed, if desired.

The entire assembly so far described is inserted into a holder 18, whichhas been recessed, as shown at 18, for the reception of the outer race20 of the bearing. The assembly is held in place in the holder by aknurled bolt 22.

It will be appreciated from the above description that, in rotating thedie element, it must rotate about the precise axis or center of thebearing l0. 1

It will be appreciated furthermore that the axis of rotation of the dieelement remains unchanged, regardless of the number of times it becomesnecessary to remove the assembly from the holder Hi. It is quite obviousalso that, when the assem-,- bly is removed from the holder, noparticular care is necessary in replacing it, the recess in the holderbeing truly concentric with the outer race of the bearing, the latter,of course, being truly concentric with the inner race.

It will be appreciated that the assembly may be reversed in the holderwithout displacing the axis of rotation, which is at the precise centerof the bearing.

It will be appreciated furthermore that the die casing 2 may be removedand then placed in position again as often as may be found necessarywithout disturbing the concentricity of the casing with the bearing, therecess in the die receptacle e being truly concentric with the bearing.No particular care need be exercised in placing the die casing withinthe die receptacle, and the die casing may be reversed when necessary ordesirable without disturbing the concentricity of the die.

The mounting of the holder i6 is immaterial to this invention. I haveshown a shaft-like extension 24 on the rear face of the holder,thisshaft extending through fixed member 2%. The outer end of the shaftmay be threaded through another fixed member 28, so that, by turning theshaft with knurled flange 39 on the shaft, the holder may be movedlengthwise in fixed member 26. The shaft is held in adjusted positionby' screw 32. This arrangement provides for proper setting of the workwith respect to the tool 34.

The tool 34 can be a cutting or drilling tool or a lapping or grindingtool, and, so far as my in-- vention is concerned, it may be mounted inany conventional fashion. The only essential is that initially this toolshall be centered exactly, with any of the indicators or other wellknown instruments, with the exact center of the bearing 10.

It will be seen from all of the foregoing that my invention provides diemaking equipment which is so constructed and arranged as to enable thehole in a drawing die to be made truly round, so that the exactingrequirements of present-day specifications can be met withoutdifficulty.

It is to be understood that changes may be made in the details ofconstruction and arrangement of parts hereinabove described andillustrated in the drawing within the purview of my invention.

What I claim is:

1. Apparatus for the drilling and piercing of dies, said apparatuscomprising a rotatable assembly composed of a die casing, a diereceptacle having a recess for the reception'of the die casing to mountthe casing concentric with the die receptacle, and a bearing for thereceptacle concentric with the die casing and receptacle; a holder inwhich the assembly is removably mounted; and a drill mounted externallyof said assembly and holder and rotatable about an axis aligned with theaxes of the die casing, receptacle, and bearing; the said assemblybeinginvertible in said holder while maintaining the, axial alignment of thedrill and assembly.

2. Apparatus for the drilling and piercing of dies, said aparatuscomprising a rotatable assembly composed of a die casing, a diereceptacle for mounting the casing concentric with the receptacle, and aconcentric bearing for the receptable; a holder in which the assembly ismounted; and a drill mounted externally of said assembly and holder androtatable about an axis aligned with the axes of the assembly andholder; said assembly being removably mounted in said holder to permitthe assembly to be inverted while maintaining the axial alignment of theassembly and drill.

3. Apparatus| for the drilling and piercing of dies, said apparatuscomprising a rotatable assembly composed of a die casing, a diereceptacle for mounting the casing, and a bearing forthe receptacle,said elements being concentrically disposed relatively to each other; aholder in which the assembly is removably mounted; a drill mounted forrotation externally of said assembly and holder, said drill beingaxially aligned with the axes of the assembly and holder, said assemblybeing invertible in the holder while maintaining the said alignment ofdrill and assembly; means at one end of the die receptacle for applyingpower thereto to rotate the same when in initial position; and means atthe oposite ,end of the die receptacle for applying power to thereceptacle to rotate the same when in inverted position.

4. Apparatus for the drilling and piercing of dies, said apparatuscomprising, in combination, a recessed, non-rotatable holder; a ballbearing removably mounted in the recess of said holder and comprisinginner and outer concentric races, means for maintaining the outer racefixed with respect to said holder, a rotatable die receptacle fittingwithin said inner race and concentric therewith, said die receptaclebeing provided with a recess concentric with its periphery, a die casingmounted in said recess and 'concentric therewith, said die casing beingro- REFERENCES CITED The following references are of record in the fileof this patent:

UNITED STATES PATENTS Number Name Date 367,733 Wallace Aug. 2, 18871,428,209 Blount Sept. 5, 1922 1,885,178 Bsteh Nov. 1, 1932 2,530,424Dickinson Nov. 21, 1950 FOREIGN PATENTS Number Country Date 548,533Great Britain Oct. 16, 1942

